Nanocomposite powder for inner electrode of multilayer ceramic electronic device and fabricating method thereof

Abstract

There are disclosed a nanocomposite powder for an inner electrode of a multilayer ceramic electronic device and a manufacturing method thereof. The nanocomposite powder for an inner electrode of a multilayer ceramic electronic device includes a first metal particle having electrical conductivity, and a second metal coating layer formed on a top surface or a bottom surface of the first metal particle and having a higher melting point than that of the first metal particle.

1 . A nanocomposite powder for an inner electrode of a multilayer ceramic electronic device, comprising:
 a first metal particle having electrical conductivity; and   a second metal coating layer partially formed on a surface of the first metal particle.   
     
     
         2 . The nanocomposite powder of  claim 1 , wherein the first metal particle is made of nickel (Ni) or palladium (Pd). 
     
     
         3 . The nanocomposite powder of  claim 1 , wherein the second metal coating layer is made of any one selected from a group consisting of ferrum (Fe), palladium (Pd) and platinum (Pt). 
     
     
         4 . The nanocomposite powder of  claim 1 , wherein an amount of the second metal coating layer ranges from 1 to 10 parts by weight, relative to 90 to 99 parts by weight of the first metal particle. 
     
     
         5 . The nanocomposite powder of  claim 1 , wherein a mean particle diameter of the first metal particle having the second metal coating layer formed thereon is 100 nm or less. 
     
     
         6 . The nanocomposite powder of  claim 1 , wherein the first metal particle having the second metal coating layer formed thereon has a lamellar shape. 
     
     
         7 . The nanocomposite powder of  claim 6 , wherein the second metal coating layer is formed on at least one of a top surface and a bottom surface of the first metal particle having the lamellar shape. 
     
     
         8 . An inner electrode paste for a multilayer ceramic electronic device, comprising:
 a nanocomposite powder for an inner electrode of a multilayer ceramic electronic device, including a first metal particle and a second metal coating layer partially formed on a surface of the first metal particle and having a higher melting point than that of the first metal particle; and   an organic vehicle including a binder, an organic solvent, or the like.   
     
     
         9 . The inner electrode paste of  claim 8 , wherein an amount of the nanocomposite powder for an inner electrode ranges from 30 to 80 parts by weight; and
 an amount of the organic vehicle ranges from 20 to 70 parts by weight, in relation to 100 parts by weight of the inner electrode paste.   
     
     
         10 . The inner electrode paste of  claim 8 , wherein the first metal particle is made of Ni or Pd. 
     
     
         11 . The inner electrode paste of  claim 8 , wherein the second metal coating layer is made of any one selected from a group consisting of Fe, Pd and Pt. 
     
     
         12 . The inner electrode paste of  claim 8 , wherein an amount of the second metal coating layer ranges from 1 to 10 parts by weight, relative to 90 to 99 parts by weight of the first metal particle. 
     
     
         13 . The inner electrode paste of  claim 8 , wherein a mean particle diameter of the first metal particle having the second metal coating layer formed thereon is 100 nm or less. 
     
     
         14 . The inner electrode paste of  claim 8 , wherein the first metal particle having the second metal coating layer formed thereon has a lamellar shape. 
     
     
         15 . The inner electrode paste of  claim 14 , wherein the second metal coating layer is formed on at least one of a top surface and a bottom surface of the first metal particle having the lamellar shape. 
     
     
         16 . A method of manufacturing a nanocomposite powder for an inner electrode of a multilayer ceramic electronic device, the method comprising:
 mixing a plurality of first metal particles, a plurality of second metal particles having a higher melting point than that of the first metal particles, and a dispersion medium in a chamber; and   rotating a shaft equipped with a plurality of rotors to rotate inside the chamber, thereby partially forming second metal coating layers on surfaces of the first metal particles by using the second metal particles.   
     
     
         17 . The method of  claim 16 , wherein the forming of the second metal coating layers on the first metal particles is performed by mechanical alloying. 
     
     
         18 . The method of  claim 16 , wherein the first metal particles are made of Ni or Pd. 
     
     
         19 . The method of  claim 16 , wherein the second metal particles are made of any one selected from a group consisting of Fe, Pd and Pt. 
     
     
         20 . The method of  claim 16 , wherein an amount of the second metal coating layers range from 1 to 10 parts by weight relative to 90 to 99 parts by weight of the first metal particles. 
     
     
         21 . A multilayer ceramic electronic device, comprising:
 a laminate body having a plurality of dielectric layers formed therein;   first and second inner electrode patterns formed by printing an inner electrode paste for a multilayer ceramic electronic device on the plurality of dielectric layers and exposed to opposite end surfaces of the laminate body, wherein the inner electrode paste includes, a nanocomposite powder for an inner electrode of a multilayer ceramic electronic device that includes a first metal particle and a second metal coating layer partially formed on a surface of the first metal particle and having a higher melting point than that of the first metal particle; and an organic vehicle including a binder, an organic solvent, or the like; and   first and second external electrodes formed on the opposite end surfaces of the laminate body, to which the first or second inner electrode patterns are exposed, and electrically connected to the first or second inner electrode patterns.   
     
     
         22 . The multilayer ceramic electronic device of  claim 21 , wherein an amount of the second metal coating layer ranges from 1 to 10 parts by weight relative to 90 to 99 parts by weight of the first metal particle.